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 #include &lt;QtGui&gt;

 #include &quot;regexpdialog.h&quot;

 RegExpDialog::RegExpDialog(QWidget *parent)
     : QDialog(parent)
 {
     patternComboBox = new QComboBox;
     patternComboBox-&gt;setEditable(true);
     patternComboBox-&gt;setSizePolicy(QSizePolicy::Expanding,
                                    QSizePolicy::Preferred);

     patternLabel = new QLabel(tr(&quot;&amp;Pattern:&quot;));
     patternLabel-&gt;setBuddy(patternComboBox);

     escapedPatternLineEdit = new QLineEdit;
     escapedPatternLineEdit-&gt;setReadOnly(true);
     QPalette palette = escapedPatternLineEdit-&gt;palette();
     palette.setBrush(QPalette::Base,
                      palette.brush(QPalette::Disabled, QPalette::Base));
     escapedPatternLineEdit-&gt;setPalette(palette);

     escapedPatternLabel = new QLabel(tr(&quot;&amp;Escaped Pattern:&quot;));
     escapedPatternLabel-&gt;setBuddy(escapedPatternLineEdit);

     syntaxComboBox = new QComboBox;
     syntaxComboBox-&gt;addItem(tr(&quot;Regular expression v1&quot;), QRegExp::RegExp);
     syntaxComboBox-&gt;addItem(tr(&quot;Regular expression v2&quot;), QRegExp::RegExp2);
     syntaxComboBox-&gt;addItem(tr(&quot;Wildcard&quot;), QRegExp::Wildcard);
     syntaxComboBox-&gt;addItem(tr(&quot;Fixed string&quot;), QRegExp::FixedString);

     syntaxLabel = new QLabel(tr(&quot;&amp;Pattern Syntax:&quot;));
     syntaxLabel-&gt;setBuddy(syntaxComboBox);

     textComboBox = new QComboBox;
     textComboBox-&gt;setEditable(true);
     textComboBox-&gt;setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

     textLabel = new QLabel(tr(&quot;&amp;Text:&quot;));
     textLabel-&gt;setBuddy(textComboBox);

     caseSensitiveCheckBox = new QCheckBox(tr(&quot;Case &amp;Sensitive&quot;));
     caseSensitiveCheckBox-&gt;setChecked(true);
     minimalCheckBox = new QCheckBox(tr(&quot;&amp;Minimal&quot;));

     indexLabel = new QLabel(tr(&quot;Index of Match:&quot;));
     indexEdit = new QLineEdit;
     indexEdit-&gt;setReadOnly(true);

     matchedLengthLabel = new QLabel(tr(&quot;Matched Length:&quot;));
     matchedLengthEdit = new QLineEdit;
     matchedLengthEdit-&gt;setReadOnly(true);

     for (int i = 0; i &lt; MaxCaptures; ++i) {
         captureLabels[i] = new QLabel(tr(&quot;Capture %1:&quot;).arg(i));
         captureEdits[i] = new QLineEdit;
         captureEdits[i]-&gt;setReadOnly(true);
     }
     captureLabels[0]-&gt;setText(tr(&quot;Match:&quot;));

     QHBoxLayout *checkBoxLayout = new QHBoxLayout;
     checkBoxLayout-&gt;addWidget(caseSensitiveCheckBox);
     checkBoxLayout-&gt;addWidget(minimalCheckBox);
     checkBoxLayout-&gt;addStretch(1);

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout-&gt;addWidget(patternLabel, 0, 0);
     mainLayout-&gt;addWidget(patternComboBox, 0, 1);
     mainLayout-&gt;addWidget(escapedPatternLabel, 1, 0);
     mainLayout-&gt;addWidget(escapedPatternLineEdit, 1, 1);
     mainLayout-&gt;addWidget(syntaxLabel, 2, 0);
     mainLayout-&gt;addWidget(syntaxComboBox, 2, 1);
     mainLayout-&gt;addLayout(checkBoxLayout, 3, 0, 1, 2);
     mainLayout-&gt;addWidget(textLabel, 4, 0);
     mainLayout-&gt;addWidget(textComboBox, 4, 1);
     mainLayout-&gt;addWidget(indexLabel, 5, 0);
     mainLayout-&gt;addWidget(indexEdit, 5, 1);
     mainLayout-&gt;addWidget(matchedLengthLabel, 6, 0);
     mainLayout-&gt;addWidget(matchedLengthEdit, 6, 1);

     for (int j = 0; j &lt; MaxCaptures; ++j) {
         mainLayout-&gt;addWidget(captureLabels[j], 7 + j, 0);
         mainLayout-&gt;addWidget(captureEdits[j], 7 + j, 1);
     }
     setLayout(mainLayout);

     connect(patternComboBox, SIGNAL(editTextChanged(const QString &amp;)),
             this, SLOT(refresh()));
     connect(textComboBox, SIGNAL(editTextChanged(const QString &amp;)),
             this, SLOT(refresh()));
     connect(caseSensitiveCheckBox, SIGNAL(toggled(bool)),
             this, SLOT(refresh()));
     connect(minimalCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));
     connect(syntaxComboBox, SIGNAL(currentIndexChanged(int)),
             this, SLOT(refresh()));

     patternComboBox-&gt;addItem(tr(&quot;[A-Za-z_]+([A-Za-z_0-9]*)&quot;));
     textComboBox-&gt;addItem(tr(&quot;(10 + delta4) * 32&quot;));

     setWindowTitle(tr(&quot;RegExp&quot;));
     setFixedHeight(sizeHint().height());
     refresh();
 }

 void RegExpDialog::refresh()
 {
     setUpdatesEnabled(false);

     QString pattern = patternComboBox-&gt;currentText();
     QString text = textComboBox-&gt;currentText();

     QString escaped = pattern;
     escaped.replace(&quot;\\&quot;, &quot;\\\\&quot;);
     escaped.replace(&quot;\&quot;&quot;, &quot;\\\&quot;&quot;);
     escaped.prepend(&quot;\&quot;&quot;);
     escaped.append(&quot;\&quot;&quot;);
     escapedPatternLineEdit-&gt;setText(escaped);

     QRegExp rx(pattern);
     Qt::CaseSensitivity cs = Qt::CaseInsensitive;
     if (caseSensitiveCheckBox-&gt;isChecked())
         cs = Qt::CaseSensitive;
     rx.setCaseSensitivity(cs);
     rx.setMinimal(minimalCheckBox-&gt;isChecked());
     QRegExp::PatternSyntax syntax = QRegExp::PatternSyntax(
             syntaxComboBox-&gt;itemData(syntaxComboBox-&gt;currentIndex()).toInt());
     rx.setPatternSyntax(syntax);

     QPalette palette = patternComboBox-&gt;palette();
     if (rx.isValid()) {
         palette.setColor(QPalette::Text,
                          textComboBox-&gt;palette().color(QPalette::Text));
     } else {
         palette.setColor(QPalette::Text, Qt::red);
     }
     patternComboBox-&gt;setPalette(palette);

     indexEdit-&gt;setText(QString::number(rx.indexIn(text)));
     matchedLengthEdit-&gt;setText(QString::number(rx.matchedLength()));
     for (int i = 0; i &lt; MaxCaptures; ++i) {
         captureLabels[i]-&gt;setEnabled(i &lt;= rx.numCaptures());
         captureEdits[i]-&gt;setEnabled(i &lt;= rx.numCaptures());
         captureEdits[i]-&gt;setText(rx.cap(i));
     }

     setUpdatesEnabled(true);
 }</pre>
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